A free Outdoor Discovery series at Alameda Park, conducted by the Butler County Parks and Recreation Department, will feature “The History of Butler’s Historic Movie Theaters” by Bill May at 6:30 p.m. Thursday in the Oddfellows shelter. Programs run Thursdays through Aug. 15 (except no program July 4). Specialty Outdoors: Birds, Mammals & More will be presented June 27. Call 724-284-5383.

Succop Nature Park, 185 W. Airport Road, Penn Township, will host “Birds and More” nature walks at 9 a.m. Thursdays. The newly renovated T.W. Phillips Barn is one of the major elements of the Audubon Society of Western Pennsylvania’s $7 million Centennial Campaign. Call 412-963-6100 or visit www.aswp.org.

Jennings Environmental Education Center, Route 528, Brady Township, hosts Silver Sciences: Ecosystem Exploration: Forest vs. Prairie for active Senior Citizens! from 9 a.m. to noon Tuesday, Register for this free program online at http://events.dcnr.pa.gov/ or by calling the center at 724-794-6011 no later than Monday.

Moraine State Park will host a free yoga series from 4 to 5 p.m. Saturday at the Pleasant Valley day use area on the South Shore. A program on purple martins will be from 10 to 11:30 a.m. June 29 at Pavilion 6 at the McDanels Launch area. An International Mud Day Celebration is planned for noon to 3 p.m. June 29 at Lakeview Beach on the North Shore. And a family fishing program is set for 10 a.m. to 12:30 p.m. June 30 at Bear Run on the South Shore.